A friend recently asked an interesting question, for which I had no answer. It was "Have you ever done a mag check at full throttle in climb?" He had been doing it for many years, with many airplanes, and a recent one had been showing roughness.
At first I went "Huh?", but a little thought says the test makes a lot of sense. It is good to know if the engine operates in a satisfactory manner on one ignition at WOT, and I cannot think of any mechanical reason to recommend against it.
The PIREP? My IO-390 is currently firing Tempest massive electrode plugs with a 500+ hour non-impulse Slick, and Denso iridium plugs with a EDIS-based electronic ignition. Passing through 500 MSL at WOT, switching off either ignition offered no clue except immediately rising EGT. No roughness, and if there is a power loss, the prop governor covers it up. Without the EGT instrumentation, I could not tell it was running on just one.
Maybe it's just me, but I'd not heard of mag checks at WOT. Was I asleep when they passed out the instructions? What are ya'll doing out there?
At first I went "Huh?", but a little thought says the test makes a lot of sense. It is good to know if the engine operates in a satisfactory manner on one ignition at WOT, and I cannot think of any mechanical reason to recommend against it.
The PIREP? My IO-390 is currently firing Tempest massive electrode plugs with a 500+ hour non-impulse Slick, and Denso iridium plugs with a EDIS-based electronic ignition. Passing through 500 MSL at WOT, switching off either ignition offered no clue except immediately rising EGT. No roughness, and if there is a power loss, the prop governor covers it up. Without the EGT instrumentation, I could not tell it was running on just one.
Maybe it's just me, but I'd not heard of mag checks at WOT. Was I asleep when they passed out the instructions? What are ya'll doing out there?